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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.25 (1993) No.2 ■■■■■■■■■■■■■■■■■■■ |
| 自動車エキゾーストマニホールド用ステンレス電縫鋼管の品質 Quality of ERW Stainless Steel Pipe for Automotive Exhaust System 新司 修(Osamu Shinshi) 板谷 進(Susumu Itadani) 豊岡 高明(Takaaki Toyooka) |
| 要旨 : 自動車排ガス装置のステンレス化に対応すべく高品質のステンレス電縫鋼管を製造できる新成形法ミル（ＣＢＲ成形ミル）を開発し，工程生産を開始した。新成形法の採用により，成形面ではロール庇の解消および付加的成形歪の軽減による成形材の加工硬化抑制を図った。設備面では，圧下ロールバックラッシュ吸収機構およびプリロード＋プリセット機能を付し，寸法精度の向上および溶接前エッジ変動の激減を図った。操業上は，ガスシールド溶接技術に加え，新たに完全無水・無潤滑造管を行い溶接品質の向上を達成した。その結果，製品のパイプの曲げおよび拡管加工性は著しく向上し，38.1ｍｍφ×2.0ｍｍｔ（Ｒ409Ｌ，未焼鈍材）で30ｍｍＲ（約0.8×外径）曲げ加工が可能となった。 |
| Synopsis : In order to respond to the tendency towards stainless steel exhaust pipe, Kawasaki Steel Corp. has developed a new forming process and mill, i.e., a CBR forming mill. It has been operating satisfactorily at Chita Works. This process is characterized by features mentioned below. In forming, flexibility of forming rolls, scratchless forming and reduction of work-hardening of material have been achieved by adopting a new forming process. In the mechanism of the mill, new roll pre-setting with pre-loading and the balance system of rolls has also been developed, so that high dimensional accuracy of pipe has been achieved and variation of edges of the formed sheet before welding has also been decreased. In welding, gas shielded welding without cooling water and a lubricant has been possible. Consequently, high quality ERW stainless steel exhaust pipe, which has excellent formability in bending and expanding, has been satisfactorily produced in the CBR forming mill. For example, R409L as-welded stainless steel pipe of 38.1mm φ×2.0mmt was capable of being bent into 30mmR(0.8×OD). |
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